fix(felhom-wipe): detect drives via .felhom-infra-backup, clean empty /mnt/ dirs

- detect_storage_paths(): also matches drives that have .felhom-infra-backup/
  so sys_drive-style mounts (internal SSD partitions with DR markers) are
  detected even when settings.json is gone and felhom-data/ doesn't exist.
- do_nuclear_wipe(): rmdir all empty /mnt/*/ dirs at end of nuclear wipe
  to clean up leftover mount point directories (e.g. /mnt/hdd_1 when the
  raw mount was already cleaned by a prior wipe run). rmdir is safe — it
  refuses non-empty directories.
- print_plan(): show per-drive .felhom-infra-backup entries for nuclear level.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/felhom-wipe.sh

@@ -121,9 +121,11 @@ except: pass
 " 2>/dev/null || true)
     fi
 
-    # Also scan /mnt/* for felhom-managed dirs not in registry
+    # Also scan /mnt/* for felhom-managed dirs not in registry.
+    # Detect by presence of felhom-data/, legacy appdata/backups/, or .felhom-infra-backup/
     for d in /mnt/*/; do
-        [ -d "${d}felhom-data" ] || [ -d "${d}appdata" ] || [ -d "${d}backups" ] || continue
+        [ -d "${d}felhom-data" ] || [ -d "${d}appdata" ] || [ -d "${d}backups" ] \
+            || [ -d "${d}.felhom-infra-backup" ] || continue
         local already=false
         for sp in "${STORAGE_PATHS[@]:-}"; do
             [ "$sp" = "${d%/}" ] && already=true && break
@@ -248,7 +250,15 @@ print_plan() {
         echo -e "  ${RED}DELETE${NC} Traefik container"
         echo -e "  ${RED}DELETE${NC} Cloudflared container"
         echo -e "  ${RED}DELETE${NC} Portainer container + volume"
-        echo -e "  ${RED}DELETE${NC} .felhom-infra-backup/ (DR markers on all drives)"
+        echo -e "  ${RED}DELETE${NC} .felhom-infra-backup/ (DR markers on detected drives):"
+        local dr_found=false
+        for sp in "${STORAGE_PATHS[@]:-}"; do
+            if [ -d "$sp/.felhom-infra-backup" ]; then
+                echo -e "    ${RED}DELETE${NC} $sp/.felhom-infra-backup/"
+                dr_found=true
+            fi
+        done
+        $dr_found || echo -e "    ${GREEN}(none found)${NC}"
         if [ -d /mnt/.felhom-raw ]; then
             echo -e "  ${RED}UNMOUNT+DELETE${NC} /mnt/.felhom-raw/ (raw helper mounts + fstab entries)"
             # Show each raw mount and its bind target
@@ -463,6 +473,14 @@ do_nuclear_wipe() {
     rm -rf "$infra_root/cloudflared" && info "  Removed: $infra_root/cloudflared/"
     rm -rf "$STACKS_DIR"    && info "  Removed: $STACKS_DIR/"
 
+    # Remove any leftover empty mount point dirs under /mnt/ (e.g. /mnt/hdd_1 after
+    # the bind mount was already cleaned by a prior wipe run). rmdir is safe: it
+    # refuses to remove non-empty directories, so user data is never at risk.
+    for mp in /mnt/*/; do
+        [ -d "$mp" ] || continue
+        rmdir "$mp" 2>/dev/null && info "  Removed empty mount point: $mp" || true
+    done
+
     echo ""
     info "Nuclear wipe complete."
     echo -e "${CYAN}To redeploy, run:${NC}"